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Re: 2002 chevy tahoe, i have fuel, i have spark, but wont...

Well the third ingredient is compression, but I will assume you have that. You say you have spark, so I will assume you checked for spark at the plugs. How do you know you have fuel spray at the injectors ?

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You either have a bad plug wire or have cracked one of the new plugs while installing them. Try watching under the hood while someone else accelerates the engine to locate the noise.
Good luck dont forget to rate.

replace fuel pump relay. check all fuses to ignition and pcm .make sure they are not loose. check coil wires make sure they not loose.look at battery if you have the ac delco seal battery make sure green eye still there .if its black have battery check out.

EACH ONE OF THE SPARK PLUGS IS LOCATED UNDER INDIVIDUAL COILS. YOU MUST FIRST REMOVE THE BOLT ON TOP OF THE COIL AND GENTLY TWIST AND PULL UP ON THE COIL WITHOUT RIPPING THE BOOT. UNPLUGGING THE ELECTRICAL CONNECTOR IS NECESSARY ON MOST MODELS. SOME OF THE NEWER MOTORS HAVE A COVER ON THE TOP OF THE ENGINE THAT HIDES THE COILS. PLEASE KEEP ME POSTED. THANKS FOR USING FIX-YA. BEST OF LUCK

Fuel filter. Timing/timing chain. Idle air control valve. Idle sensor. Vacuum leak. Probably one of the above, but the filter is cheapest place to start. Change your air filter too, if you haven't for a while.

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Check the fuel pump relay or the fuses. Could also be a filter near the injection rail. You might have a fuel cut off swithc. I don't know where it would be, but your owners manual would tell you. Good luck anyways.

The list of possible causes is long.You'll have to figure out if it is fuel or ignition related to proceed.I would check fuel pressure and spark first. If you can't duplicate the symptom it may be tough to diagnose.

I would replace
1. spark plugs. Do not go cheap on the plugs use the proper AC Delco spark plug
2. cap and rotor
3. spark plug wires
4.fuel filter
and then i would have a fuel injection cleaning done . there is not a timing adjustment or air fuel adjustment this is all done by the PCM ( Powertrain Control Module )

replace fuel pump relay. check all fuses to ignition and pcm .make sure they are not loose. check coil wires make sure they not loose.look at battery if you have the ac delco seal battery make sure green eye still there .if its black have battery check out.